What is the purpose of a 'safe distance' between vessels?

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Safe distance is the buffer that gives you time and space to take effective action to avoid collision. You can’t count on the other vessel to do exactly what you expect, so you keep enough room to slow down, change course, or stop if needed and still have time to assess and respond safely. The amount of space isn’t fixed; it depends on speed, stopping and turning distances, how maneuverable the vessels are, and conditions like visibility, weather, and traffic. A larger vessel typically requires more room because its maneuvering and stopping take longer. This margin also accounts for uncertainties in other vessels’ actions and for you to communicate or coordinate if necessary. While other aspects like priority rules or fuel use aren’t the purpose of safe distance, keeping this margin ensures you can act effectively to prevent a collision.